Flattening of the terrain is a great idea, and makes sense if you are building on uneven terrain, I guess it's how you go about it, not sure if you remember the Populous game series from years ago, it's a classic game, when you build a hut (or any building for that matter) if the terrain is uneven, the villager/peasant would jump up and down in the spot that needed flattening and the terrain would gradually lower to match the level of the surrounding terrain, was quite a cool thing to watch.